if somebody is R user - there are good news. We open-sourced an R-Geckoboard API which makes it easy to communicate with the Dataset API as well as the Custom Widget API. Additionally, for rendering images to be used within the Image Widget there is an R method to optimize the resolution. Here the link:
Do not hesitate to contact me if you have some questions. Btw, the package will be published on CRAN within a few days.