is there such a thing as a cake for diabetics?

[schmamy]

So my mom asked me to make a cake for my dad's birthday next week. His favorite is white cake with chocolate frosting, and I know they both will be expecting cake from a box and frosting from a can. (Which is actually yummy to me, in spite of my desire to move toward healthy eating and my enjoyment of cooking from scratch )

But my dad is an insulin-dependent diabetic. Which you would never know from his diet Cake like that is the last thing he should be eating.

So I'm wondering, is there such a thing as a diabetic-friendly cake recipe? I'm totally willing to make both the cake and frosting from scratch...but it can't be too weird or they won't like it. I've thought about trying Splenda, even though I am philosophically opposed to fake sugar...but I'm afraid it would ruin the taste. I can't abide the aftertaste of fake sugar. My exposure to Splenda--in flavored water, maybe? I can't remember--was not positive.

HELP!