I've tried to remain creative here too... but the humidity and heat has gotten the better of me a few times and although I've had a few successes, the failures have been epic. For my sister-in-law's birthday I decided to just stick with a basic cake without any fancy shape cutting or tower building.
Yes, that is supposed to say 'Happy Birthday'. Fail.
Anyway, I am happy to tell you about my discovery that for between $5-10 dollars I can purchase a beautifully personalized non-melted cake, and I don't even have to plan ahead. I just pop into the local bakery and they hand over the personalized cake right on the spot. Goodbye, cake anxiety!
P.S. I did do a castle cake and a snowman cake for two birthdays this past April. They turned out ok, but there was some stress and melting involved... and nothing looks nearly as nice as the cakes I used to do in cooler climates. :(