This is nice online collage creator – make it here and then upload the image into your index page, remember to make sure you have the dimensions of the content area of your template ( will have to ask the designer if you don’t know ). You won’t have *hot sopts* which means you won’t be able to click on the images to go the category or page, but at least you’ll be able to have a nice collage of images and can change them out yourself when you need to.

http://www.fotor.com/features/collage.html