Ok basic user with PS7....am browsing the clipart books for celtic designs to use in a project. But these are b&w? How does one give them color....not coloringbook filling in. But the b&w lines?
TIA

On the top toolbar.. Go to
Layer/ Layer Style/  Color Overlay
You could also use the pattern or gradient overlay or styles to give them different looks..
Check out the Adobe Exchange for lots of patterns etc that you can use..

If you have segments of white that are enclosed by a black line, you can use the 'paint bucket tool' to fill those areas with color.

I'm using CS2 so I'm not sure if this works in PS7, but this is the way that I would change the black lines in a black and white image to another colour.

First make sure that the image is in RGB or CYMK (Image>Mode>RGB Colour or CYMK Colour)
Then add a Channel Mixer adjustment layer (Layer>New Adjustment Layer>Channel Mixer)
Then just start adjusting the sliders till you find the colour that you want.
Adjusting the "Constant" slider helps keep the white of your image white.
For some additional adjustments you could add a Hue and Saturation Adjustment Layer on top of your Channel Mixer.

Another way is to use the Duotone mode (again not sure if it is in PS7)

Go to Image>Mode>Duotone
Click on the colour box to choose your colour shade.

In the "Type" box you can choose Monotone, Duotone, Tritone or Quadtone

Depending on the level of detail in your black and white image you can get some nice colour transitions using Duo, Tri and Quad types.  You can also change the curves of each of the inks to alter the balance of the colour blends.