Hi Lilsarge,
My husband is diabetic as well. Over the years I have found his favorite Birthday cake is very simple and yet Delicious! I love the cake as well.
1 Pre-made Sugar Free Angel Food Cake (get at any grocery store)
1 Tub- Sugar Free Cool Whip (I get the large one, it is better value)
fresh fruit, we love Peaches, Blueberries, Strawberries, use anything that he loves. If fresh fruit is not an option where you live, canned: drain and wipe off juice with paper towel, frozen, thaw in colander.
Slice Angel Food Cake into equal 3rds, horizontal (use a bread knife or seratted knife, will cut with out squishing the cake.)
Slice up fruit thin, place all over the cut layer of cake, top with coolwhip, place 2nd layer on and repeat the fruit and cool whip. Place top of cake on cover with coolwhip, add fruit to top of that.. If you are also adding candles, cut an X in the fruit that you will be putting a candle in, helps to hold it upright as the coolwhip is not thick like frosting.
I hope this will help in giving you some options, In all honesty, this has become a favorite of mine as well. Sometimes, I do not layre the fruit, I just mix it in with the coolwhip then frost the cake as usual.
Cheryl