We can't really help you directly, but do you have some kind of picture editing program at home?
If you have one, what you could do is :
1- Try to find the elements (like the fire) on google or yahoo, etc.
2- Edit it. If you're not familiar, check help file.
3- For the size, export a title that came with the RTP. (If it's with RPG mkr 2k3, try to convert it in 256 color).
4- Then, we assume that you know how to import things...
***It's kind of hard to explain, because it involves really visual work...