Blogger friends - please help!

As many of you may know from previous posts, I'm planning my cousin's upcoming 25th PJ Party birthday - which is a week from Saturday. I really want to make some cute cupcake toppers, water bottle wrappers, stickers, etc. (you know... what most of you sell in your Etsy shops!), but I have NO idea what the dimensions of them are! Could someone please help me out by letting me know the dimensions you use - pre-printed? I'd really, really appreciate it! Thanks! :)