When it comes to treehouse design, anything goes, which means endless creative opportunities, especially if you've made it a side project to collect nifty salvaged materials for years, like designers Joyce Hesselberth (of Kid Baltimore) and David Plunkert. They recently completed this amazing treehouse, complete right down to the must-have bucket on a pulley, for their children. Total cost: $300.

David, who designed and built the treehouse (and who, according to Joyce, "never throws anything away, ever"), bought the lumber and most of the siding brand-new, but pretty much everything else is repurposed, including:

• the entrance sign, expanded metal mesh, tricycle wheel and the handle (made from and old industrial drill bit), all found on the family's property before they built their house
• corrugated metal roof left over from a 10-years-ago renovation of the couple's design studio (When they're not building amazing arboreal structures, they run a design shop, Spur Design.)
• metal flower boxes nabbed from Ikea's tent sale for a mere $4 each
• baby head mold, on the top of the post, was a flea-market find from the eastern shore.
• left-over scrap siding from a gallery show

See the full reveal, along with more photos, at Kid Baltimore.

[Photos courtesy of Joyce Hesselberth]