Having nooks in your classroom with bean bags or soft cushioned chairs are perfect for reading and other small group activities. Your students will be stimulated by the lively colors also.
Every school doesn't allow lamps, but if your school does, jump on this idea! Lamps can do so much for your room. It can set the mood. Often, when I wanted my students to do an activity where they were working independently and I needed everyone calm...
If you're doing any activities on the floor, pillows are great to have. Students really prefer having them rather than leaning their backs against the hard classroom walls.
If you're doing read alouds or having moments when you want your students to come to the floor, rugs are great to have. You can also use rugs to designate areas for specific small group activities. Students love a nice, soft rug for sitting.
Just like how beautiful curtains can add to the decor of a home, they can also do the same for your classroom. Having curtains in your classroom can make it feel warm and inviting for both students and their parents.
Simple accessories like string lights or garlands can really set the tone of your classroom environment.