1. Pokemon Red/Blue

2. Zelda: Links Awakening

3. Final Fantasy Adventure

4. Zelda oracle of seasons

5. Super Mario Land 2

1. Zelda Link's Awakening

2. Pokemon Crystal

3. Wario Land 3

4. Tetris

5. Super Mario Land 2

1. The Legend of Zelda: Link's Awakening

2. The Legend of Zelda: Oracle of Ages

3. Donkey Kong

4. Final Fantasy Adventure

5. The Legend of Zelda: Oracle of Seasons

...oh god, there's a tons of great games I feel guilty about not listing (FFL2, Gargoyle's Quest, MM5, Mario Land 2, Wario Land 1-3, Metroid 2, Tetris, Kirby 2/Pinball, Shantae, Mario Golf, Ducktales, Mole Mania, DW1-3, etc, etc)

1. Zelda Link's Awakening DX

2. Zelda Link's Awakening (oh yes I did )

3. Zelda Oracle of Ages

4. Zelda Oracle of Seasons

5. Super Mario Land 2 SGC

Hrm... that means I have to remember all my old GB games, doesn't it? :P Let's do this:

1. Tetris

2. Super Mario Land 2

3. Final Fantasy Legend 3

4. SMT: Devil Children

5. Kwirk

1. The Legend of Zelda - Link's Awakening
2. The Legend of Zelda - Oracle of Seasons
3. The Legend of Zelda - Oracle of Ages
4. Super Mario Land 2: 6 Golden Coins
5. Pokemon Red

Edit Oops messed up. Sorry I didn't read enough.

1. Metal Gear Solid
2. Pokemon Yellow
3. Monster Rancher Battle Card
4. Pokemon Trading Card Game
5. Pokemon Pinball.

Sorry for the mistake again. I didn't play many games. And What I played was mostly pokemon.

1 pokemon blue/red

2 marioland 3 warioland

3 final fantasy adventure

4 legend of zelda oracle of ages

5 metroid 2

Per the OP:

Please make a list of the top 5 original Gameboy / Gameboy Color games that you like.

So yes, GBC games are fair game.

Tetris

Super Mario Land 2

Metroid 2

Super Mario land 1

The Legend Of Zelda: Link's Awakening