I concur word for word with Tazalexis and MariaLovesCakes!!!!!
Sometimes I want to quit right in the middle of decorating a cake or cookies. I want to quit when I've been at it all day long and it's 10 at night and I have about another hour's work. I just want to scream sometimes!!!!
Having a 3 yr old and a 7 mo old doesn't help me a whole lot either. I have to really stretch a cake project into an all day event, which sucks because no one gets fed dinner when that happens.
Walking away and taking a break really does help. Cleaning up as you go works for me because I know I am the only one who will clean up the mess and darnit if I want my kitchen to be a total bomb when I finish!
Just take a break from decorating for a while and like others have said, you'll see something you just have to try and make and you'll get inspired again.
Take a deep breath!!!!!