Well it only takes a few moments to take the frames apart and swap in your own images.
Step 1: Step 1: Make and Trim Replacement Prints
The trick is sizing your prints to that dimension, and then adding white canvas space around the images, turning the digital image file into a 6.85" square image, with a white border extending to 8x8 inches. Then add more space on the sides of your digitial image (say with photoshop?), turning it into an 8x10 standard print size. * Then send your images to the local online photo printer as 8x10 prints.
When you are ready to hack your Ikea frame, simply trim the prints to the 8x8 inch size.
*I usually add the extra width space in the last step as pure black, to balance the white border around the print. That way the photo printers wont darken my photo if they auto adjust the printing to mid-tone grey.
Step 2: Step 2: Remove the Frame Backing
Step 3: Step3: Separate the Image Backing From the Frame
Step 4: Step 4: Apply Roller Glue to the Photos
The key part of this step is to put the image down on a hard smooth surface before applying the glue. if the surface that the image is on has any "give" to it, then the roller mechanism will create long divot lines across the image, ruining it. Do not press hard on the photo with the roller if you can avoid it.
I usually cover about 50% of the photo's back surface with glue, as I am not going to be able to go back and fix the image if it falls off later.
An alternative method would be to apply the glue directly to the surface of the original images that came with the frames. This would avoid putting divot grooves in the images, but you run the risk of placing the adhesive outside of the replacement photos.
Step 5: Step 5: Carefully Lay Down the Images
Then simply roll out the rest of the image so that it is in contact.
Step 6: Step 6: Press the Images to Set the Glue
There is a metal hanger piece on the backboard, which you will have to hang off the edge of a table so that you can really press firmly on the images.
Step 7: Step 7: Glue Backboard Into Place With Hot Glue
BUT BEFORE YOU APPLY THE GLUE...
---->> turn the frame over carefully (holding it together) and check that no dust, or particle board cruft, has crept inside your frame when you put the back in place. This happens about 50% of the time.
If its all clean, simply run a bead of hot glue around the back edge to re-seal the frame.
In this instructable, I changed the photos in an Erikslund frame, but the same basic steps apply to almost all of the preloaded picture frames at Ikea, including the cool "shadow box" style pictures.