Always nice to talk about M/M ships (in part because, uh, boys ❤). Some of my favorites are Stygian x Flash Magnus, Soarin' x Thunderlane, Thorax x Pharynx, Star Bright x Silver Script (especially this one, I envision it like Lyrabon but with husband horses — "goldensnack" is a nice background pairing too but it doesn't click with me as much), Troubleshoes x Braeburn, Rumble x Button Mash, and a multitude of various rule 63 ships.
Some other ones that I enjoy seeing here and there, but that aren't my figureheads… any combination of Sunburst, Shining Armor, and Flash Sentry is pretty cute to me. Gallbar is cute but I do appreciate Yonabar and Gallstream too so I'm a bit split. Stygian's kinda cute with Sombra too based off of snowberry's (NSFW) pictures. Oh, and Garble x Fizzle is a fun one.