Make ugly porch look good

You have options! You can clean and stain it, you can do an acid stain or you can paint it. I would go with acid stain. Instead of providing links to each individual video here is a link that shows the various options. http://www.bing.com/videos/search?q=clean+and+stain+concrete&qpvt=clean+and+stain+concrete#a

You can get the plastic molds like that you would you use to make pavers & use them as stencils. Bricks, cobblestones, etc & either paint or stain-

You can paint it get creative too and tape off patterns and use different colors

Outdoor carpet?

We just redid our porch. First I filled in all the cracks with concrete filler. Then I used a waterproof concrete floor primer and then used deck and porch paint to paint the entire surface. After the initial sealing and painting is done, you can tape or stencil any design you would like over the top.

I had a similar porch. You need 4 items! I bought 2 different color porch paint, wood grain tool, and I used 4 inch board that was laying around. Painted with one color after dried went back through and wood grained. Then used board and permanent marker to make look like boards. It turned out great!!!!

Acid stain. See http://www.directcolors.com

I had a product called Restore put on on my porch to prevent falls when it is wet or icy. It's like at rubberized product, is easy to apply with a roller and comes in a multitude of colors'

Maybe try CLR, seen them use it on cement on ads.

As one professional painter told me "Cement and paint are best friend". You can easily prime and paint it with porch and floor paint.Once you have your base coat down, you can put on stencils or any other designs.

Personally, I would stain it!

There is stuff called concrete stain that would make it look awesome, but it takes some work.