I love Nellie too !
Other games I find beautiful:
- Barracora (its backglass would be nice close to my spectrum)
- Taito Mr. Black (Brazilian clone of Defender). Sick but beautiful.
- Fathom
- Black Hole
- Tron
- Nemo
- Farfalla
- Dancing lady (1966...)
I love BBB but not (only) for its art...