Great photos are all about light, shape, form, contrast and... color. Color is powerful. It can create mood, passion and tell a story. This example from Naveen Jamal's Flickr Stream is a good example.

If you're trying to get a blue sky, don't be afraid to underexpose some to avoid losing the rich colors. That's what I did in this photo from my own Flickr stream. You can also use a polarizing filter which will help bring out a deep blue color from the sky and control the way light is reflected off of flat surfaces in your image.

Here's a great photo from dlemieux's Flickr stream. She has several great sets of street photography. One way to get a great photo is to scout out your location looking for a good background. Then setup and wait for people to walk by. It's the people in front, framed by the background that can give you a great photo.

Flickr.com is a rich resource of ideas for photo themes. One Flickr feature worth checking out is Flickr Groups. Groups are areas on Flickr where users post photographs that relate to a common theme. One example is the Geometric Beauty group. This image from KrystiAn pAn.K's Flickr site is a good example from the Geometric Beauty group or "pool."

Here's another great photo from the same pool from Toetap's Flickr stream.

Here are some of the more interesting groups:

• B&W
• Catchy Colors
• Frame Within a Frame

You can participate in groups created by others or create your own. Here are some guidelines for managing a healthy group and the Flickr Groups FAQ.