This is very easy to make a frame using Rectangle under Draw at Image Magick.
You can use a color to draw the rectangle or make it gray and then go back and fill it in with a background of your choice.
I'll give an example of how I made above image.
Step 1. Go to Image Magick and use a blank of 350x375 (clear background). You can make this by using xc and None in the Meta box (you will find this scrolling down after you've entered I.M.)
Step 2. Go to Draw and click on Rectangle and co-ords are: 0,0 350,375 --- NO fill color -- Stroke color Gray and Stroke Width 12 Draw again this time just change the numbers to: 20,20 330,355 and Stroke of 10
Step 3. Put in a background and use Composite +0 +0 Center and Atop and Misc
Step 4. (Note: take out the Atop and Misc) Composite using OVER for your Gif and Center +0+0 and a flower or ivy using Northwest +5+5 (using Over)
Step 5. Output as a GIF and do Shadow at http://www.playmaster101.com/IMAGEMASTER101/RAPE-AND-PILLAGE/Shadow.php Dave's Shadow Tool and put in whatever color you want the background to be (everything else remains the same). Output and take it back to Image Magick to optimize or take off the shadow on bottom and right side (using Crop under Transform and using -18 -18 optional)
Listed below are the images I used for my tiger cubs.
For printer's convenience: http://www.wtv-zone.com/MsLee/Animals/cubs.gif http://www.wtv-zone.com/MsLee/Bgs/gold-tre.jpg http://www.wtv-zone.com/MsLee/Flowers/ivy.gif