Welcome to Ecomodder, we are happy that you have joined the fuel sipping team!
I use the Dash Command app myself and skins for it can be found at dashxl.net, I personally prefer it myself.
Here are two of the many skins available:
Here are some links that help:
65+ Vehicle modifications for better fuel economy - EcoModder.com
100+ Hypermiling / ecodriving tips & tactics for better mpg - EcoModder.com