Create with online tools:

http://www.nga.gov/kids/ make a virtual collage, mobile and more

http://www.pbs.org/hanshofmann/push_and_pull_001.html   Push and Pull puzzle

http://snowflakes.lookandfeel.com/   Create and save snowflakes

http://www.girlsgotech.org/mandala.asp   Create mandalas

http://gwydir.demon.co.uk/jo/mosaic/index.htm   Make a Mosaic

http://www.wsd1.org/lgc98/teach/Paint/makefish.htm Tessellation Tool

http://www.rctednet.net/numeracy/english/topics/maths_art.htm Create patterns

http://www.morethanmath.org/triangles.htm Triangle patterns

http://www.boxermath.com/plp/modules/online/workshop/toolbox/mosaictool3

http://www.mrpicassohead.com Mr. Picassohead - drawing Picasso faces

http://www.protozone.net/AJinteractives1.html Various Interactive Creation Tools

http://www.architectstudio3d.org/AS3d/index.html   Architect Studio 3-d

http://www.artsconnected.org/playground/index.shtml   ArtsConnectEd Playground

http://www.artsconnected.org/toolkit/create_types_line.cfm   The Artist's Toolkit

http://www.zefrank.com/dtoy2/index.html Draw toy

http://www.ldraw.org/   Lego CAD drawing

http://www.cs.uu.nl/people/markov/kids/draw.html Drawing for Children - free download

http://www.brl.ntt.co.jp/IllusionForum/basics/visual/index-e.html Visual illusions

Sites with games about art and artists:

http://www.metmuseum.org/explore/justforfun.asp Metropolitan Museum of Art

http://www.artic.edu/artexplorer/ Art Institute of Chicago

http://www.artsology.com/home.php   Artsology Culture for Kids

http://www.kn.pacbell.com/wired/art2/index.html Looking at Art

http://www.virtualartroom.com/interactive_exercises.htm games about art

http://www.tate.org.uk/learning/kids/   Tate Museum

Websites with lists of more interactive art sites for kids:

(Please be warned: I have not yet checked all from these lists. Let me know if you find any you really like)

http://manila.esu6.org/kelliw/stories/storyReader$404   

http://www.princetonol.com/groups/iad/lessons/middle/for-kids.htm   Art for Kids!