Mayo Monograms offers a bunch of monogram styles. Some have coordinating frames as well.
2 letter diamond
2 letter diamond
Bijou
Bijou
Brave
Brave
Chapel
Chapel
Circle script
Circle script
Deco diamond
Deco diamond
Diamond
Diamond
Fishtail
Fishtail
Monogram script
Monogram script
Octogram
Octogram
Oval
Oval
Sailboat
Sailboat
Slant
Slant
Stack
Stack
Surfs up
Surfs up
Victorian
Victorian