You can find it int Google Playstore!

Gzaas is a web application for creating and sending easy&cool full screen messages.
http://gzaas.com

More info at
http://gzaas.com/project/about/wtf-is-gzaas
http://gzaas.com/project/es/sobre-gzaas/que-es-gzaas/ (spanish)

This Android Client has the following features:

• SDK Min version 2.2 (API Level 8)
• Select from 7 different styles to create your full screen message
• Use of the GzaasAPI for creating gzaases

You can find a PHP client for GzaasAPI at https://github.com/gonzalo123/GzaasApi)
Thankfully made by Gonzalo Ayuso
https://github.com/gonzalo123
http://gonzalo123.wordpress.com
@gonzalo123

Gzaas Android Client:
It's beta, and...open!
You're welcome to report bugs or add new functionalities.