These brilliant Super Mario Bros. and Sonic the Hedgehog Flash online art and design games (from MarioSonicGames.com) are amongst my favourite free web games, so I thought I'd put them all together in one place here to see if you like them too:
Super Mario Brothers: Scene Creator
Super Mario Brothers: Scene Creator 2
Super Mario Brothers: Mario Dress Up
Sonic the Hedgehog: Scene Creator
Sonic the Hedgehog: Scene Creator 2
Sonic the Hedgehog: Scene Creator 3
Sonic the Hedgehog: Character Designer
Sonic: Chao Character Designer
If you like the above games, then you'll hopefully also enjoy these other art and design games (from Dan-Dare.org):
Transformers: Character Creator
Cars: Ramone's Coloring Book
Cars: Ramone's Painting
Finding Nemo: Paper Toys
Finding Nemo: Create-A-Scene
Toy Story: Etch-A-Sketch
Meet the Robinsons: Mural Mania
(See also here)