Here are some fun websites that are art-related.  I am updating often! 

 https://www.tate.org.uk/kids     All sorts of great art stuff from the Tate Museum in London

https://www.albrightknox.org/community/ak-innovation-lab/artgames-20  The coolest artist-based games

http://cdn.99rooms.com/  an online exhibition that combines painting, photography and animation

https://www.nga.gov/education/kids.html  You can create all sorts of things with the National Gallery of Art site

http://www.jacksonpollock.org/  Jackson Pollock action painting

http://bomomo.com/   Very cool abstract art creator

http://www.picassohead.com/create.html  Make your own Picasso head!

http://www.zefrank.com/dtoy_vs_byokal/  create your own kaleidoscope

http://www.papercritters.com/pc.php  Create paper origami style critters

http://www.shodor.org/interactivate/activities/Tessellate/?version=1.6.0_14&browser=MSIE&vendor=Sun_Microsystems_Inc.http://graffiticreator.net/   Great and simple tessellation tool

http://www.happydaric.com/lite-brite/index.html  Virtual Lite-Brite

http://www.getty.edu/gettygames/  Art Observation games