Seth had his birthday last month. He turned 5 just in time to start kindergarten this year. I'm always on the lookout for fun AND easy kids' cakes, so I've had this one from Lauren at Fredillicious pinned to my cake board for a while. Digging and dirt has kind of been a theme with us this summer since we've been putting in sidewalks and digging trenches for sprinkler pipe, so I thought this cake would be perfect. No tutorial, but you don't need one. Just bake a two layer cake...ours was…