Generations will live forever at this point, even SEGA's pitching in with the new version! Here's a look at what Generations could have had if it pulled from some slightly different areas in the franchise...
Main Channel: @Dolphyn.
Mods:
Modern Momentum Spindash: https://gamebanana.com/mods/498318
Windmill Isle Act 5: https://gamebanana.com/mods/500291
Unwiished Experience: https://gamebanana.com/mods/473328
Score Generations: https://gamebanana.com/mods/292798
Uekawa (SA) Sonic Model: https://gamebanana.com/mods/395853
SA2 Bounce: https://gamebanana.com/mods/376676
Unleashed Sweepkick: https://gamebanana.com/mods/405147
Wall Splat: https://gamebanana.com/mods/50780
Free Camera: https://gamebanana.com/mods/50768
Soundtrack:
Dragon Road (Night) Sonic Unleashed
3DS Rock Rock Mountain Mario Kart 8 Deluxe
Green Hill Sonic Rumble
Starlight Carnival Sonic Rumble
Silent Forest Sonic Rumble
Apotos (Day) Sonic Unleashed
Wii Moo Moo Meadows Mario Kart 8 Deluxe
Frog Forest Sonic Heroes
And Then... And Then Super Paper Mario