Have you choosen a theme for your birthday party? If you have, try and select some birthday invitations that give your guests a hint of what they can expect. If your party is for a child, select something colorful, yet whimsical, perhaps if you are having a party on outside on a farm with horse rides, consider the birthday invitation below.

It also comes with matching thank you cards so you don't have to mix and match stationery themes. This birthday invitation is a fill-in invite and can simply be completed by hand without any custom printing.
Here is an idea. For your child's next birthday, take some solid color cardstock as a background and place a smaller patterned card on top to create photo birthday invitations and the number presented as a standout.
If you ever consider having a birthday party for your pet (and are really a pet lover), make some of these basset address labels with one of these neat fun images found at your favorite stationery store, or try lovelylabels.