The Lego cake idea came from Pinterest. There are lots of links out there. Basically just make your favourite cake, ice it, and use large marshmallows cut in half to make the bumps on top. You can make one big rectangle cake, or you can cut the cake into thirds and make 3 smaller rectangles in different colours. My son said his favourite colour is white, so I lucked out and didn't have to make any different coloured icing. I'll be the first to admit that my cake icing skills are extremely limited (aka - awful). Oh well, the kids all seemed to like it.
I also thought this would be a fun recipe to try out - it reminded me of a big pile of Legos on the floor (not that my son ever leaves a big mess of Legos on the floor!)
"CLEAN UP YOUR LEGO!" JELLO CAKE (aka - Broken Glass Jello)
4 packs of Jello, assorted colours
2 envelopes gelatin
1 can condensed milk
In four square containers, dissolve each pack of Jello in 1 c. boiling water. Chill overnight (or for at least 3-4 hours.) Slice into squares and arrange in a 9x13" baking dish. Sprinkle gelatin envelopes over 1/2 c. cold water, and then add 1 1/2 c. boiling water. Stir to dissolve, and then pour in condensed milk and cool. Once cool, pour over jello pieces and let it set overnight.
The kids had a great Lego party - they had contests to see who could build the coolest robot, who could build a tower the fastest, who could find the most Lego figurines in the scavenger hunt, who could guess how many Legos were in the jar, and then they worked together to join all their towers together and make the tallest tower. Now we're done with kid birthdays until next January. Phew.