What will they do?

[V07]

Hi,
I am a beginner in Win32 so sorry for the childish question.

I have seen many software with designs
see here
http://screenshots.en.sftcdn.net/en/scrn/32000/32736/ccleaner-22-700x525.jpg

you can see the alphabet "C" with a brush which resembles like a cleaner.

I tried the same by using bitmaps and achieved successfully. But now my problem is

I used CFF Explorer a free resource editor for my builded ".exe" file.
I can see my bitmap in the resource editor and can replace with any other images

and I came to know that the alphabet "C" with a brush in that software(which is not created by me) is not a bitmap.

If it is not a bitmap then How do I do like it??

Thank you