I like to use nepps, I think they add some interest to the felted items, especially if there is a combination of colours. Like this tea cosy:
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And even more in this glasscase:
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The problem is that I have nepps of white colour only. Of course WoW offer a variety of colours but the choice is rather limited and the price... I try to use some "dyes" what I have in my household and here we are! I use the combinations of three colours and the result is very pleasing: