The invitations for any wedding shower should be suited for the type of guests that you’re going to have. If the people are very familiar with each other, you can easily go for the fun&casual style. However, if the guests are not all familiar with the person making the invitation or the bride (yes, it shouldn’t be at the party, but who knows the circumstances) - in that case you should go for a general text.

If the person making the invitations is the bridesmaid, things change a little - but you have some nice examples here to inspire you:

If those aren’t enough, or if you want to go for a ready-made themed invitation, you can always check out these: