The site "Ulster Ireland Genealogy," offers users a searchable database of photos dealing with headstones from County Tyrone. Click on the banner that says "County Tyrone--The Gravestone Project."
In addition to grave stones, you can do a Tyrone-wide search for other genealogical information. And, if you scroll down the page you can find links to the other counties in Ulster besides Tyrone.
There is more to this site that I can easily write about. Take your time and fully explore it on your own.
Check it out at: http://www.cotyrone.com/