Exactly what it sounds like, yes. I'll be dumping here various things from the Mega Man hacks I've played. Note, this isn't absolutely perfect, as I need to reassemble each sprite piece-by-piece, which is tricky. I also add a few details here and there.
Rockman L:
(http://imageshack.us/a/img6/8843/uvg1.png)
Storm Man: (http://imageshack.us/a/img69/3310/rd2.png)
Melt Man: (http://imageshack.us/a/img197/9240/2k0.bmp)
Killer Man: (http://imageshack.us/a/img441/8259/zf24.png)
Hydro Man: (http://imageshack.us/a/img600/6183/jk2q.png)
Flare Man: (http://imageshack.us/a/img571/9096/pvn8.png)
Data Man: (http://imageshack.us/a/img834/1926/kav0.png) (Sort of unfinished, sorry.)
Blade Man: (http://imageshack.us/a/img542/1553/jwbk.png) (this was made before MM10)
Aurora Man: (http://imageshack.us/a/img823/6706/5bes.png)
The weapons: (http://imageshack.us/a/img198/6421/cgz.bmp) (Data Man's weapon is not included, as it's exactly the same as Flash Man's.)
Rockman Peercast: (Note: I have to admit... The spritework isn't so great on this one. If you're going to make skins of these guys, I recommend cleaning up the sprites first.)
(http://img96.imageshack.us/img96/4625/rrw0.png)
State Man: (http://imageshack.us/a/img46/1271/unw.png)
Reel Man: (http://imageshack.us/a/img825/8673/g6n.png) (I think this guy is more about CDs than Reels...)
Pizza Man: (http://imageshack.us/a/img443/6373/88d2.png) (wut)
Khwwww Man: (http://img6.imageshack.us/img6/2302/30dl.png) (No, I don't know.)
Cheat Man: (http://imageshack.us/a/img89/3886/aoi5.png) (Ugh.)
CClash Man: (http://imageshack.us/a/img694/8045/wgyx.png) (No, that isn't a typo.)
Buffer Man: (http://imageshack.us/a/img543/5192/8g5i.png) (I like the catfaic he has going on.)
Banana Man: (http://imageshack.us/a/img15/4858/tvdr.png) (wut 2: wut harder)
Rockman 2 Plus:
(http://imageshack.us/a/img43/7358/zi2o.png)
Amulet Man: (http://imageshack.us/a/img89/4226/y9nr.png)
Danger Man: (http://imageshack.us/a/img833/2756/o9ih.png)
Blade Man: (http://imageshack.us/a/img833/1209/u5ba.png) (He's from MM3PC. His weapon is recolored from black.)
Torch Man: (http://imageshack.us/a/img38/3595/d5v.bmp) (Also from MM3PC.)
Clock Man: (http://imageshack.us/a/img545/473/y7g4.png)
Liquid Man: (http://imageshack.us/a/img543/3128/dql2.png) (Hello, weird Bomb Man edit.)
Shock Man: (http://imageshack.us/a/img208/664/ql5b.png) (Hello, obvious Needle Man edit.)
Soul Man: (http://imageshack.us/a/img33/9353/j8lj.png) (Brothah, Ring Man got SOUL!)
Rockman E:
(Note: These aren't that good.)
(http://imageshack.us/a/img703/2298/plq1.png)
Watch Man: (http://imageshack.us/a/img542/9727/hvjf.png) (Blatant Flash Man edit is Blatant)
Volt Man: (http://imageshack.us/a/img199/9109/olr.bmp)(Not to be confused with the DOS Robot Master. At least his design is okay.)
Shoot Man: (http://imageshack.us/a/img853/2277/ev8n.png)(Meh.)
Meteo Man: (http://imageshack.us/a/img153/4897/ymoc.png)
Ghost Man: (http://imageshack.us/a/img542/1946/u09i.png)
Freeze Man: (http://imageshack.us/a/img707/2117/x8h7.png) (Could they not think of a better name, or did they not know Mega Man 7 exists?)
Clay Man: (http://imageshack.us/a/img6/6835/fuwn.png)
Blaze Man: (http://imageshack.us/a/img41/6303/xko7.png) (UGH this is ugly.)
-Probertmang
(Note: WHAT HAS SCIENCE DONE?!)
(http://img823.imageshack.us/img823/4613/ueyt.png)
Abomination Man: (http://imageshack.us/a/img197/2163/okr.bmp) (The Stage Select's name for these are all messed up, so I'm naming these myself.
Crashing Man: (http://imageshack.us/a/img21/6851/m23t.png)
Fishface Man: (http://imageshack.us/a/img716/6473/0i91.png)
Wut Man: (http://imageshack.us/a/img855/6971/651z.png) (The hat thing makes me think he might be a chef?)
All the other ones are either unchanged (Flash and Quick), just have a different face (Heat Man), or only one frame is different (Wood Man).
Other:
(Note: these are ones that aren't original Robot Masters, but are still redesigns.)
Heat Man: (http://imageshack.us/a/img802/1576/m8ay.png) (From Rockman Grey Zone)
Air Man: (http://imageshack.us/a/img607/3519/p1bu.png) (Also from Rockman Grey Zone)