Scaling a small image

I have two extremely small images that I need to scale up. Unfortunately i can't post them but i need to know if anyone has any ideas on how to go about making them look more presentable.

Thanks!

There are a few of interpolation methods in IMAGE>IMAGE SIZE but resolution is absolute... once an image has a given resolution you can't just make it up.

there are also some interpolation utilities out there that do a fair job. you can try some of them.... Genuine Fractals and *(Stair Interpolation pro) SI Pro 2 spring to mind.