This is the classic war poster "Keep Calm and Carry On" reworded to "Keep Calm and Party On". I've kept the original traditional crown at the top. It's a nice happy simple design, with a message we can all get behind!
I've put this on a red background, but you can change that really easily. Hit 'Customize it' and then 'edit', and you'll be able to change to absolutely ANY color you prefer.
This design is available on lots of different products, and I have other 'keep calm' variations including more 'party on' designs, all available at my store.