Lego - great set of geometric shapes!
https://flic.kr/p/cNwRAA | GC2 Part 2: The forgotten Palace | Stained glass. Thanks to Katie Walker for the great tutorials =D
Lego curves! http://www.flickr.com/photos/robertfoord/9395185346/in/set-72157634849248578/
Leog - Just gettin' started with macaroni bricks... | Flickr - Photo Sharing!
Useful Shapes for Cheese Slope Mosaics by eilonwy77, via Flickr