NoeQuarter is a heat stippling outfit that has been doing good work for some time now. They have a new site, NoeQuarter.com, and they are offering their custom stippled backstraps for the S&W M&P direct on the site. They are available for all common M&P models and in your choice of 3 different textures. These are done by hand in New Hampshire and they cost just $25 a piece shipped.
That is some sweet work!
If only I owned an M&P to try them out on.