Woww! Thanks dude! Helps a lot! Really, you are my liberator! I didn't knew how to do that! Now I can continue my map.

Your name will be in the Credits section

-TheGuyHi, I was wondering if you could summon a banner with patterns? No give, no setblock, but summon. IS this possible?

Banner items themselves do not have any unique item data. Instead, the banner item variants use the "BlockEntityTag" to store the potential data for the tile entity itself (so you'd be looking at data for the tile entity rather than the item). This particular tag holds tile entity data for any items that have a tile entity associated with it, such as chests and spawners. So for example, summoning an Item entity as a banner with a basic black background and white skull:
/summon Item ~ ~1 ~ {Item:{id:minecraft:banner,Count:1,tag:{BlockEntityTag:{Base:0,Patterns:[{Pattern:sku,Color:15}]}}}}

Summon Item puts items on the floor. But yeah, summon is mostly used for mobs, not non-living entities. So that's not what I'm talking 'bout.

Well for a while summoning things with dyed leather armor wasn't possible, but then they added that in a mini-update sort of thing. So maybe it's not possible right now and you'll have to wait for an update or two. (or maybe what I'm thinking of is summoning mobs with armor, I'm not entirely sure, but if no solutions now wait for it.)

I want it to be on the ground and to not be pickupable/dispawnable. I know how to do theses. I'm sure it's possible :l

But If you throw a banner on the grounds, it's an entity, right? You can summon a banner, but I dunno how to make the base <certain-color> and add paterns.. I'm shure it's possible.

No, banners are BlockEntities, not normal entities. You have to use give or setblock.