Brown can be tricky colour to match with vibrant colours as Brown is not a fun colour. Brown and its shade are for timeless classic designs. It only goes well with conservative colours like white, black,grey and glass. Couple of options below

Hi Murthy, See from the window reflection in your kitchen, I think that you've got the glossily finished tile for your kitchen. I hope that it's not glossy tiles and probably the light effect in the photo. What kitchen countertop are you planning to select? Select cabinet color in accordance with the kitchen countertop material. -Thanks -Neelam -Lines and Profile

Hi Anuragini, You can cover the gap with antique crockery. Don't go for plants as it will be difficult to maintain and won't be a safe option. Or just keep it open. By covering up you might end up making space look more crowded. -Thanks, -Neelam -Lines and Profile