K-12 Math Practice Site Needs Banner Ads

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This customer received 36 banner ad designs from 8 designers. They chose this banner ad design from yadunath as the winning design.
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Banner Ad Design Brief
We're looking for new ad banners to try out across the Google Display Network. We can try either (or both) animated gifs, or Flash-based banners.
We test with 160x600, 300x250, and 728x90 sizes. If any of the sizes of new banners win, we'll create the other less-trafficked sizes and try them as well.
We're looking to increase our conversions per impression as compared to our existing banners which are attached. We're looking for these banners to appeal more to parents with children who need help with math, as opposed to teachers.
Our site is http://www.ixl.com. Feel free to borrow art from the site solely for the purposes of this project.
Target Market(s)
Parents with kids in the household, with a slight preference to Moms.
Industry/Entity Type
Look and feel
Each slider illustrates characteristics of the customer's brand and the style your logo design should communicate.
Elegant
Bold
Playful
Serious
Traditional
Modern
Personable
Professional
Feminine
Masculine
Colorful
Conservative
Economical
Upmarket
Requirements
Must have
- As these are for the Google Display Network, all banners submitted must be compatible with Google's guidelines (see here: http://support.google.com/adwordspolicy/answer/176108)
Nice to have
- We definitely want animation in the banners, to keep the banners more noticeable and to keep CTRs high. Hover effects if you go the Flash route are also encouraged.
Should not have
- The ads should be positive in message. No Comic Sans please!