Minecraft Modded Items now has item frame data included. There is now a way to customize many of the vanilla blocks, by using the data pack. These blocks are not generally customizable, but the blocks in this modding packs can be changed and placed in any kind of frame. This makes for a much more diverse experience when creating structures.
The vanilla game only has four types of frames: the flat surface, a four corner block, the pillar block, and the air. There are only two texture options for these blocks. I would recommend using the “cloth” texture, as it looks better, and blends in better with the environment. These blocks do not need any additional modifications.
The Minecraft modding community is an awesome place, filled with ideas and helping to each other on every aspect of modding. Everyone is free to join in on discussions on any aspect of modding, from new additions to old favorites. It really is like having a “band-aid” for every little block in the game. Just letting go of the old stuff and adding in the new, and fixing whatever is broken. You can create something out of thin air. Just be sure you know what you are doing, and have someone that is capable of doing it with you.
In order to add item frames to your creations, first, you will need to have the right kind of texture blocks for your item frame. Each block has a different “format”, when it comes to how it is crafted. If you use a texture that does not have the right format for your block, your item frame will not look right. To see what type of block you need to create the item frame, right click on the appropriate block, and click “Craft Frame”, or “Data Block”.
Once you have created your item, you can now add all of its textures to the Data Block, by using the drop down menu next to the texture slot. Use the extra drop down menu to put in a name for the texture, and choose the type of block that should go with the texture. The Minecraft mod does not support sub-types of blocks.
You may want to do some research on which are the best colors for your frame. Some of the colors look great together, but others do not match well at all. Try out a variety of different colors until you find one that looks good on the item you are trying to craft. When you have found an item that looks good in the crafting frame, you can save the texture and use it over again.