trying to find out what's wrong with my tomato plants (pics)

[brian zimmerman]

I started growing tomato plants this year from seed, my plants were transplanted about 10 days ago and were looking really good.

This morning though I noticed that all 4 of them had something strange about the lower leaves.

And the top leaves are bending up but not curling up

They were a light purple color around the veins with a light yellow tint between them (mostly still green ) and the tint is kind of blotched around.

The tips of the leafs are bending up and the edges on some have tightly curled under the leaf.

I've attached pics to show the color and curling leaves.

Any ideas would be great. it would be really disheartening to lose the first 4 tomatoes that I started