I have had great success with grouping ceramic knick knacks found in thrift stores or clearance and then spraypainting them black (usually gloss, but I've tried a few matte as well)

I go for birds, frogs and wire stuff (odd birdcage found one that just looked like a Victorian monstrosity) that will just look creepy with a coating of black - or even white depending. I found a really a couple of cutesy birds on a tree branches (not antiques I swear!) that were pastel colors and hit them with a glossy black, and arranged them with some antique books - instant raven flock that was quite nice. Found an ornamental frog on a rounded column, same thing. Looks great worked in with other Halloween-y touches.

Same thing with picture frames - spraypaint some thrift store finds and group. Any that look even slightly ornate look fabulous black or gloss white and may even be kept around after Halloween (I do now!) I keep an eye out for really lovely old photographs from 1800 to early 1900s, (find these all the time at flea markets for under $10) and love having a group of these with lovely frames. Add a couple of spindly-legged spiders and some ripped cheesecloth as a table topper, and it's quite a spooky display.

@FrankiesGirl

Your ideas sound awesome! We haven't decorated much this year but we put zombie dolls on the tree in our front yard. You find the rattiest barbie dolls you can find (usually pretty cheap at the thrift store) and spray paint them white. Then using a black sharpie, give them eyeliner and new eyes. Then red sharpie for the lips. We hang them with string from our dark purple plum tree in the front yard. My son loves making zombie dolls!

I like to put vintage Halloween diecuts in the windows for Halloween..