Maybe you should. Map practice is always nice, and more free-to-use materials for people are too.
Fun fact: N426’s updated Castle tileset is amazing. It has loads of depth in what it’s capable of, and looks great doing it.
In fact, I made several 15x10 maps with it! Here, take a look.
Map 1: Forest Cabin
A small house in the forest; well-furnished, with nice wood floors and a table. A fine place to relax between the battles and wars of Fire Emblem. Best used as a cutscene map, but I could see it working as a seize map (start outside, with a party split in the bottom left and top right), or as a defend map (start in the inner room).
Map 2: Underground Prison
You or your allies have been locked up in these underground cells. Make your escape and free the other prisoners! Probably best off if you start in the bottom left or top right, with the goal of reaching the other of those points (to escape in the top right, or to defeat the boss in the bottom left). Recruitable green units are in the prison cells.
Map 3: Outpost of Fort Gaiden
Who doesn’t love Fire Emblem Gaiden? Well, a lot of people, but that’s besides the point. Start on the far right, with an objective of seizing the throne or routing the enemy. Archers fire at you from the side rooms.
Map 4: The Baron's Castle
The enemy commander or corrupt noble is fortified inside their castle. Make your way in to defeat them! Start all the way on the right, and the objective is to seize the throne. A Thief emerges from the stairs and tries to loot the chest room.
Map 5: The Castle Moat
Fire Emblem needs more castles with small buildings enclosed within a great wall. The bridge should start off unavailable, but the hidden switch in the bottom right lowers it and opens the gate. Start in the bottom left, and the goal is to seize or to defeat the boss.
Map 6: Royal Great Hall
In this grand throne room, the ruler holds their court. Do you seek to protect them, to receive orders from them, or to strike them down? It could work as a seize map with you starting in the bottom right, as a defense map with you starting around the throne, or simply as a cutscene map.
You can download all six of the maps here. They don’t have tile changes, though; you’ll need to do those yourself. As with my previous maps, all six are free to use and free to edit.