Hahaha, here, have my very specific and obsessive organization style.
I have twelve folders in three rows, with a few spaces.
C G G G G
R H _ T D
X S A _ g
All folders except the last one are formatted at two rows of icons, so each folder can have ten visible apps at once.
No folder has more than ten applications inside.
All of the folders have a SMW badge somehow attempting to symbolize what's inside.
What all folders are:
_: Not a folder. Empty.
C: There's the game cart slot. It's not a folder.
G: I have four folders for games, sorted by complexity (so if I want to play some really difficult or complicated game I just go to that folder, same for simple games).
R: I have a folder for game hacks/hack tool (game specific save modifiers, and CTGP-7).
H: I have a folder for homebrew games. It's empty because I keep forgetting to install some.
T: I have a folder for TWLoader and the TWLSaveTool, once forwarders are working I wish to fill it with those.
D: I have a folder for DSiware games. These used to be in the games folders but I ran out of space.
X: I have a folder for all of my CFW management and stuff (FBI, HBL, NTR CFW, JKSM, Luma Updater, Themely)
S: This folder contains the system titles, e-Shop, camera, etc.
A: Applications that I've downloaded from the eShop. Pokémon bank, calculator, Colors 3D and some other random stuff I forgot.
g: This just contains Face Raiders and H&S. I don't use this folder really, but it makes the menu look more even.