Thanks for your suggest. That tool (Tweaker) seems similar to "cfg_editor". Looks like interesting, but it don't help me with the broken pieces of blocks. Anyway, thanks for your time.
Thanks, your code works perfectly!
However, I'm afraid that I forgot another blocks' sprites that I need change its palette too:
The sprite when a "yellow block" is hit...
...and "? block" is hit.
Could you help me with these others sprites?
(Maybe, I could do it by myself if I would know that part of your code refers to the sprites)
Your help has been very useful. Many thanks.