I cant run power to my shed so I want to know can I use the solar cells from the outdoor lights to make a solar panel?

I love your idea! If I were going to tackle this I think I would try just one first. You're going to have to figure out how much area 1 yard light will light,(I'm thinking that they are low wattage). This maybe the stumbling block here, you may find it will take a whop of yard lights! But it depends on how big the shed is and how much light you need. If the shed is small and you won't be working or reading out there, I could see were just a few might work. If this is your 'Dog House' and you're in it much, you may need more lights and some plumbing too! If you just need enough light to pop in and grab an item once in awhile, then you should be able to pull this off. Evenly space the lights on the inside, locate an on/off switch close to the door. The mini solar panels can be grouped together, but must be positioned with respect to the travel of the sun. I'd hook all the batteries in parallel, or maybe if I could get a bigger battery to replace them, depends on the exact circumstances though. Next the positive wire would feed through the switch and on to the lights,(the lights should be hooked in parallel with each other). While this is only a concept it should guide you down the right path. Good luck!!!

Gidday Chris;
Have a look at this retail shed light.... http://www.graysonline.com/Lot.aspx?id=3692971 ...
You could make better but it'll probably cost more.
Don't be led down the garden light path (pardon the pun), buy some decent cells, a 4 amphour 12volt battery, a 6 watt controller and make a top notch unit for yourself.
The cells in the garden lights are sealed in a polyurethane laminate which loses it's clarity after 2 or 3 years, reducing it's efficiency.
If you're determined to do a DIY, which is a good thing, then have a look at the instructables I've posted on panel building and My Solar Setup.
http://www.instructables.com/id/DIY-Solar-Setup/
There might be something there you can use.
All the best with it.
Rob.

Thh panels are the same - wire them up with some sort of charge controller and you'd be fine. Theres an ible on here where someone extends the leds from the solar lights themselves - keeping the original hardware.