My son wanted Lego Chima party invitations for his birthday but sadly there are no commercially available to purchase so I went to Lego's website and downloaded their wallpapers and made these party invites. I removed the specific parts that pertained to our party so you can use any picture editor that accepts PSD files (Gimp, Paint.net, Photoshop, Photoshop Elements) and add text lines for your own party.
I'll show you what steps I did to make it as easy as possible.
Step 1: Edit File
When you open the template files (there are 4 files that each have 3 characters) you will see that everything is formatted to fit 3 invites per sheet of paper.
All you need to do is use your photo editors text tool to add each line of text. The text line of "You are Invited" is the font Algerian, and the line "Unleash the Power" is Younger Than Me font. You can easily download that font by google searching "Younger Than Me font".
If the editing product you have does layers you can merge the text of one invite then copy that layer and paste it 2 other times and move them onto the remaining so you do not have to type all of the invites you just have to do one.
On the text that I made I beveled and contoured the text. The settings I used are in the attached picture (71% Depth, 2px size and the contour is the default 50%)
Step 2: Printing
Once you have the party information saved to each invitation you need to print. I used a nice heavy card stock and it came out really nice. Make sure you use Landscape mode when you print so it all fits on the paper. I left enough margin space that you should not have any issues with your printers.
If you have any questions please comment and I'll respond.