FPGA Atlys Spartan 6 output predefined image or string through HDMI
Your question has received no response so:

First: "or maybe provide a premade source code"
No, we do not provide source code to solve your problems. It against the rules and for a good reason.

Second: I had a quick look at xapp495. The very first diagram shows that the application needs a video stream: three 8-bit data streams (RGB) plus Hsync Vsync an VDE. That is a more or less standard format for video and you have to make that video stream. 

Coming back to the first point: making a video stream requires a lot more code than can easily fit on a stackexchange page. So even if I wanted, I could not 'give' you that code as it is a small project by itself.
(It would take me about one or two days and that is with years of Verilog experience and a thorough knowledge of how an RGB video stream looks like).