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It would be even better if you group them together on 1 wall. This way, if you ever have friends over and musical inspiration strikes, you don't have to go all over your house and hunt down the instruments. Everything will be all in one place! While not absolutely necessary, this is a great way to turn your wall into a sort of museum. If you already have a guitar or 2 signed by your favorite band, consider getting another instrument that they play signed as well, such as a keyboard or a brass instrument. This will help make your wall look more organized. For example, if you have a collection of string instruments, hang them in order from smallest to largest. Here are some other ideas:  Group instruments by type. This includes acoustic versus electric guitars. Group instruments by color or wood type. Keep different bands separate. This is great if you have different types of instruments from multiple bands. Even if you keep your instrument behind a glass case, too much sunlight can cause it to deteriorate. Other factors you should take into consideration include temperature and humidity; both should be stable. Some instruments require more humidity than others. Ask your instrument's manufacturer about the proper storage conditions. Even if your instrument is slender, such as an electric guitar, it may still be easily knocked off its mount if you place it in a busy location, such as near a doorway or in a hall way. Instead, hang your instruments in an area that receives little foot-traffic. Avoid hanging large, bulky instruments in small, tight spaces, even if they are not busy. If you have to suck your breath in to walk past your instrument, it's not a good spot!

Summary:
Keep your instruments together in a single room. Include a variety instruments if you are collecting from a band. Group multiple instruments together in a comprehensive order. Choose a location away from sunlight. Keep your instruments away from high-traffic areas.