The ad in the left sidebar should blend in with the navigation better. Make the URL text color gray and the link text color the same as the navigation text. I'd make the text ad unit a horizontal one and would place it right under the navigation menu. Right now the ads are placed too close together and most people are going to ignore that area and go right to the wallpapers. You might consider ditching the leaderboard ad or place it near the bottom of the page as an exit for some. You could also just use the leaderboard ad where it's at now and ditch the other ad units. This probably won't make much or any difference because of the niche, but give it a try.
It's hard to earn with a wallpaper site because people are coming to your site for wallpapers and they find what they are looking for instead of clicking an ad.
Do like Torchwood said, blend your Adsense colors to match your sites CSS colors. If it looks like an Ad most readers don't click, If the Ad looks like normal site navigation you will have a better chance of a reader clicking thru the Adsense Ad...
Wallpaper niche is very saturated. Even if you had a fanstastic site you would struggle to make it work. AdSense is basically about traffic. If a certain topic can't get you the numbers because of high competition, you have no choice but to move on. Also wallpaper topics generally have low Cost-Per-Clicks. Even if you increase your traffic you're going to struggle to really get some decent earnings from the site. Anyway good luck with it all.
These days start something new with wallpapers is more like waste of time, so people better stop doing it, think something better, because with wallpapers u will earn just a little, its simply because there is way too many sites with wallpapers and too big competition.
You need more traffic and clicks to make money Just keep develop your website, and sure you will get some earning soon
I just don't think your going to get that much good payout for the theme wallpapers. It's really over saturated that i think you would probably only get 5c a click. This kind of site would be better affiliate products or focus on some other form of monetization.
I think you need some fine tune on your current layout. 1. You have placed too many ads on the page, especially the two on header. This will caused a high impressions but low clicking = low CTR = lower earning. You can either dropped some ads at header and just use one, or try to display more speicific ads matching with your audiences. 2. Most your ads almost blinded, If I were someone looking for wallpaper I will go straight at center for them and ignore the rest automatically. You can either change the ads format or their color to make them more appealing and attractive.
why you've earned no adsense money with your wallpaper site? Because it is a wallpaper site! Read my beginners tips, I swear I didn't edited it, but you can read I'm citing wallpaper sites as one of the topics NOT TO DO if you want to earn money with adsense. People looking for wallpapers for their desktop are WAY TOO MUCH advanced technically, those people are not interesting if you want to earn adsense money. Don't waste your time making sites/blogs for them.
I went and check on your site. For all your adsense ads, it says webpage not found. Seems that there are not much related keywords ads for your site. I do believe it is pretty hard to compete as well as knowing what keywords that will be showing for the adsense ads. Maybe you can transform to another different niche instead.