How to make custom invitations

My son's birthday is coming up and we have been in the party planning mode!
He originally wanted a Skylanders themed party, and had been asking for that for a while.
The other day however, I started making up the invitations, and my husband and son were playing the newest version of Angry Birds (Transformers), and my son decided he wanted to change the theme to Angry Birds Transformers instead.
I am so happy that I was making the invitations myself and was able to do a quick change!
I know I'm not the only one who has a child who changes their mind last minute, so I thought I would share this super easy method :)
This is what we came up with. I of course filled it all in with my son's name, the date of the party, time, and other info, I left the details off of this one so you could see what the finished product would look like :)

I actually just googled 'Angry Birds transformers' and clicked on the images results.
My son and I looked through the pictures until we found one he liked.

Right click on the image and click 'save image as', save the image somewhere that you will be able to easily find it.

Then you will open your editor program (I used Picasa, which is a free program), and import your picture.

I first cropped the picture to a 4x6 size.

That's the size I was planning on printing the invitations as. 

 We then scrolled through the different fonts and my son loved this one because he said it looked like Transformer writing :)

 We then went through and added all of the details.
I saved our invitation and exported it.
I went to Walmart.com and uploaded the image and requested 10 4x6 prints.
I ended up paying $2.03 total for all 10 invitations.
Not too shabby I'd say!
The best part is my son LOVED them, and that made me happy :)