of course you can make your own.
you need to use a photo editing program, like Photoshop Elements or Paint Shop Pro. There are usually 30 day free trials you can download-then you have to pay if you want to keep using them. if you do a search on Google for "free image editor" you may be able to findn a free one to download.
I prefer Jasc Paint Shop Pro. It's not free, but it's a good value for the money.