I try to keep my pupils English-aware in every moment. We all like happy places and feeling comfortable, and kids should enjoy the learning process, so I like keeping my classroom colorful and as bright as possible! Walls are full of posters (as are yours I suppose) grammar charts, maps of English speaking countries, pupils artwork etc.
Crosswords and quizzes are always popular with learners but it can be difficult to find ones at the appropriate language level. The ones on this page http://www.eslreading.org/activities/crosswords.html are linked to themed webpages.
Any other suggestions>