I am loving these hand-made oilcloth booster seats from Boosty Yea! (yes, the exclamation point is part of the trademark)...
The new "Modern Color" palette hits the market mid-September (think powder blue with orange piping!). Fabulous!
Locals can find these at Hip & Humble and the Blue Cockatoo. If you (or rather your tot) want to test-drive a Boosty Yea! before buying, head to Finn's in Sugarhouse.
You can find a great selection online here or here. For discontinued patterns (and cheaper prices), hit Hautezone on Ebay.