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Sorry that it took me so long to respond, but I had been doing some other things. I included the wallpapers (https://github.com/ThanosApostolou/lxde-wallpapers). They will be included by default in the next release (17.0.2). Current users will get them too when the new lxde-wallpapers package hits the stable repositories (it's now on the unstable). Thx for contributing to Manjaro LXDE Edition