I'm not saying that blockland is ugly or does not allow you to build cool stuff or anything. I just think blockland need more ways to present add-ons and a few more creative things.
Add-on image and description:

Noticeable Differences (besides rtb look):
DEFAULT Add-On Saver
Add-On Image
Add-On Description
How it would work:
The default add-on saver would be really, really helpful. I know there is already one on RTB, but it seems qualified to be default.
The Add-On image would be an 206x158 .png image, any larger/smaller the game would just stretch the image to fit. I suppose it would be placed in the .zip and called "image.png".
The Add-On description would be like placing the description.txt under the image.
Planning to add detailed info about a gui texture editor also, but not right now...