Some invites I ordered from Etsy and other's I created through editing various clip art designs and adding my own text, pictures and extra touches.

This invite was purchased from Tiny Prints.  I liked using this site because it also organized the RSVPs for me.  The back of the invite allowed me to add a personal touch.

In this case I was able to find an invite that corresponded with how I wanted to decorate.  The navy chevron and yellow were showcased throughout the event.

This was a fun invite because it was in the shape of a ticket.  I found it via a google search and edited it what I wanted.  I do believe these are also available on Etsy.