Well, since we can't have a clear idea who was blonde and who was not, I did an inventory and
for heroines, we have
5 blonde,blue eyed ones (Meredith, Julianne, Corey, Lauren, Sloan)
1 reddish brown haired, blue eyed one (Katie)
3 red haired, blue eyed ones (Leigh, Jennifer, Victoria)
1 dark red haired- green eyed one (Kate)
2 dark haired, blue eyed ones (Alex, Julie)
1 dark chesnut haired, green eyed one (Diana)
1 red haired, gray eyed one (Sheridan)
1 black haired, green eyed (Whitney)
1 honeyed-blonde, green eyed (Elizabeth)
For heros, we have
6 dark haired, gray eyed ones (Clayton, Royce, Jordan, Matt, Cole, Noah)
2 dark haired, blue eyed ones (Mitchell, Stephen)
1 dark haired, green eyed one (Jason)
3 dark haired, amber eyed (Ian, Michael, Zack,)
1 tawny haired, amber eyed one (Spencer)
1 brown haired, brown eyed one (Nicki)
1 brown haired, gray eyed one (Nick)
1 black haired, black eyed one (Ramon)
Now for blonde, blue eyed heroines, I found 4 beautiful women who could be okay for our heroines. Only in one of them I saw someone specific which is Nicky Whelan. She would be a perfect Sloan I think
Charlize Theron is a good choice, but her early ages of course
Even you like all of them, still we need one more blonde, blue eyed heroine, which I couldn't find.
Nicky Whelan (Sloan, I think)
http://www.imdb.com/list/zPjFtgLok_w/?start=101#185Amber Heard
http://www.imdb.com/list/zPjFtgLok_w/#10Teresa Palmer
http://www.imdb.com/list/zPjFtgLok_w/#8I'll look more