I think there's no rules for most of them and everyone has their own way to pronunce...
1) Material Girl
2) Lovepears. here you have a link to download the CM for LOVEppears. ayu says: LOVUPIARS so: LOVE-ppears ^^
http://totalayu.free.fr/cm/Avex%20tr...rs%20Album.mpg (from TOTALAYU)
3) I pronunce CREA... there's a spanish word like that (imperative of create) and I think If someone from Japan read CREA he will say "k(u)-re-a"
here HONDA CREA CM (with ayu) she pronunce CREA as I've said ^^
4) I would go for "Ayumi Hamasaki and Hello Kitty" thouhg I say "A.H par H.K" XD
5) Since it has two "RR" I pronunce it like in spanish, the sound for "r+r" is the spanish "rrrrr" in "carro" XD so I'd pronunce VEL-FA-RRE
but here you have a CM for promoting Velfarre... they say: velfar
6) As others said, Days GREEN nothing in between.
7) I'm not french but I can help a bit: Or-kes-trea la-mu-rox You know, the french "r" from your throat (grrr xd) and the "ea" its not like pronunce e+a but a sound that it's not an "a" nor and "e" but in between XD and the "o" from "rox" i think it's like and open "o" that you have to pronunce opening the mouth like for an "a"
Hope I've been helpful ^^