Velleman also has a bunch of holiday LED kits (among many other things).
Build up with the kids, use as inspiration for an arduino design, or treat as a inexpensive collection of parts and hack into something different 
Christmas tree.
http://www.vellemanusa.com/us/enu/product/view/?id=350675
Deluxe Christmas tree - lot more LEDs
http://www.vellemanusa.com/us/enu/product/view/?id=350692
3D Christmas tree
http://www.vellemanusa.com/us/enu/product/view/?id=351133
Surface Mount Christmas tree
http://www.vellemanusa.com/us/enu/product/view/?id=351404
Santa in a sleigh
http://www.vellemanusa.com/us/enu/product/view/?id=350691
A bell
http://www.vellemanusa.com/us/enu/product/view/?id=350695
5 high x 7 wide scrolling message board
http://www.vellemanusa.com/us/enu/product/view/?id=351092
several different stars
http://www.vellemanusa.com/us/enu/product/view/?id=522248
http://www.vellemanusa.com/us/enu/product/view/?id=522251
http://www.vellemanusa.com/us/enu/product/view/?id=522428
http://www.vellemanusa.com/us/enu/product/view/?id=523250
and 2 different candles
http://www.vellemanusa.com/us/enu/product/view/?id=522281
http://www.vellemanusa.com/us/enu/product/view/?id=525536