I've got three small cakes and 48 cupcakes to decorate tomorrow and I'm burned out! I'm starting to cut corners when I really need to be creative. I need a caking boost! I'm planning on selling them on Sat. at a farmers market and using it as advertisement for myself so I really need these things to be good. But I'm so tired and over it! What do you do when you get to this point?!
Just do a simple swirl with a 1M tip, top with any royal icing flowers you might have on hand, or just some sprinkles/jimmies. It always amazes me how people ooh and ahh over the simple things! I took cupcakes to school in the spring and was so busy that I didn't have any time to decorate them. I felt guilty for not making them nicer, but everyone kept asking me how I made such a perfectly beautiful swirl and if I could make some for them!
It really helps me if I take a 30 min. break, take DD out for ice cream or something and get back to it. DH forces me to do this sometimes, because I'll just stand there in the kitchen thinking I have to get this done now! It really recharges me.
Find a swimming pool and go take a quick dip. The last time i felt like you i did this and it really helped me 'cool' off so to speak. I was able to return to the task more clear minded and ready to work. HTH good luck.
Go into the gallery here, look at all the creative ideas, and be rejuvenated! I get inspired when I see all the amazing things on this site. Simple is probably the best idea since you are tired as pp suggested, just make your colors exciting!