How do I get my picky rabbit to eat healthy?

I've had 4 rabbits for about a year now and I had been feeding them an alfalfa-based pellet (because it was the only thing that was sold in pet supplies plus, tractor supply, etc.) and I had been looking for a timothy-based pellet, finally found some at Wal*Mart, and over the past few days have given them that to eat. They don't really seem to like it, the lop will dig in it and will eat almost his entire litter box of shredded newspaper before he'll eat it.I also give them timothy hay and they'll eat that, but still not the pellets. Is there any way I can get them used to the timothy pellets? I tried putting carrots in it so they could eat the carrots with it which they like, but it still doesn't seem like they want to eat it. Please let me know. I imagine that much newspaper won't digest well over time. Thank you.