How about this little pop of red?

http://www.cb2.com/family.aspx?c=114&f=4215

It's not multifunctional, I guess, but I think it would work in the room and it's totally affordable.

What about

Eames wirebase end tables to match the coffee table?
http://www.roomandboard.com/rnb/product.do?method=get&id=101971&coll=377695&cat=62

or

eames walnut stools
http://www.roomandboard.com/rnb/collection.do?method=get&id=377358&cat=62

or

some sort of modern metal frame with a glass or marble top
http://www.roomandboard.com/rnb/product.do?method=get&id=976529&coll=377401&cat=91552828

or

Clear Acrylic nesting tables
http://www.cb2.com/family.aspx?c=114&f=117&viewall=1

If you care for wood, maybe the InModern Rekindle Side / End Table could work or the Intown low stool. You can find them at http://www.designpublic.com and they are on sale.

http://www.conranusa.com/ProductDetails.aspx?pid=24576&cid=CoffeeSideTables&language=en-US

this could work, and take a look at the rest of conran's choices...i liked the luna, ella and vira.

love the pale grey? barcelona chair on the conran site(but $$$$) for additional seating, but don't know if it's too large for your space. below is a link with craigs listings for barcelona chair/ottoman.

http://losangeles.craigslist.org/search/sss?query=%22barcelona%20chair%22

i think a rough hewn stool, out of teak or some other sustainable wood would actually be a nice contrast to the contemporary. you can find them at the "wooden duck" in Berekely.

i prefer clear tables for your space but how about these in black or hot pink: http://www.cb2.com/family.aspx?c=114&f=4669

How about ceramic garden stools, since you already have the indoor-outdoor thing going on?

http://www.cb2.com/family.aspx?c=206&f=4264

Ikea stool. Cheap and plentiful. Stack a couple up as a side table.

too cheap?

Why not get a pair of vintage end tables from Craigslist?

Take something like these:
http://chicago.craigslist.org/wcl/fuo/833649667.html
...spray paint them white and maybe add a little gold paint to highlight the grooves and you'd have a great Hollywood Regency look, and some valuable storage too.

Marisa (or anyone else) - where is that couch from? Love it. Thanks.

Since it looks like there are plenty of color punches already in the room, what about something like Crate & Barrel's C table? Stainless steel, so it works with anything. Might be too spendy for you though. You could also go with a cheaper black C table from cb2.

Your coffee table is waaaaay too big for your space.

I would trade in the table for somethign smaller, and clear acrylic or glass. I like the oval shape -- I'd stick with that that. You might try two small tables side by side. [I have the same sofa from Roomand Board, and a table about 1/2 as wide as the sofa would be more to scale I think].

As for side tables, I think something that doubles as storage would be great. Do you need extra seating? You don't say whether you entertain often. Extra seating could be as simple as moving dining chairs into the living space when you need them (I keep a dining chair in an office nook and move it to the dining table when I need the seat).

What about a saarinen tulip side table? getting the authentic one might be a bit financially difficult, but there are imitations out there.

http://www.apartmenttherapy.com/ny/scavenger/scavenger-saarinen-tulip-side-table-for-75-003577

Where is that rug from? I love it!

The other day at Target I saw this small version of hte Saarinen table that would be perfect for a side table, plus it was on clearance for under $18 each!

Here's the link:

http://www.target.com/Trumpet-Table-White/dp/B0015MJQAC/sr=1-3/qid=1221109624/ref=sr_1_3/601-0125131-7341703?ie=UTF8&index=target&field-browse=13035431&rh=k%3Awhite%20end%20table&page=1

Another suggestion, have you considered painting the top of your coffee table? The contrast with the white walls, frames and the rug with it's white elements makes me feel the room is a bit cold. Perhaps a dark navy, a rich orange or a dark red? Just a thought.

http://www.ikea.com/us/en/catalog/products/00134108

i'm obsessed with the yellow Trollsta side tables

Is that the Loring sofa from Room and Board by chance? I've considered purchasing it for a couple months now, but they don't have a show room in Arizona, and I'm wondering how comfortable it is.

CB2 Formosa Tray Tables?

http://www.cb2.com/family.aspx?c=114&f=3701

Really cheap. Use until the perfect find ?

http://www.ikea.com/us/en/catalog/products/20131627

I wouldn't say your style is mid-century based on that sofa.

In your search for the side tables, remember that not every piece of furniture in a room needs to be a big personality.

In other words, sometimes a side table is just a side table.

I'd actually look into bedside tables instead of "side tables."

And I'd do something walnut-y, to get that floor incorporated into what you've got going on.