I have both of my daughters parties together in the summer as they both are winter babies. This year we are doing a pirate theme, great for boys, girl and even teens. You can get a lot of stuff at dollar stores for it, even at Oriental trading exchange on the web. Kids as well as adults love to dress up in there best pirate garb, so Ahoy Matey!
It's a party and it won't matter if you have Diego plates for one and color for the other. My kids loved playing Pin the Tail on the Donkey and that was in the mid-90's. :) Musical chairs is still fun with their favorite music.
You could use the Diego theme and colors from the Diego theme unless your older son wants certain colors for his theme. I don't think it would be crazy if you had 2 different themes. Just specify on the invitations what the themes will be.
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