Here is my take on this. I can re-edit some of them to how you may want.(i had hard time trying to post these images hope this worked)
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i won't mind feedback
This design is the one that I like the most. I just feels like a nice and clean design and the dirt block does make the statement for me that it is talking about minecraft.
Here's what I came up with so far.
The concept is pretty simple. It's supposed to resemble a minecraft block, with the ftb name underneath. :3
I went for clean, mostly.
Also had two versions. One has the original colors on the block with a greyscale on the name (this can be changed to only one tone, or maybe white, black doesn't look so nice)
The other one is colored as a dirt block and the colors are on the text.