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Theme depends on your blog type. But try to use simple and light theme, because this will increase your site uploading. Too much fancy themes will decrease your site uploading can also decrease your Visibility to other users.
try to use theme which is being easily upload by all type of users like mobile, laptop, aslo think about slow speed connections also.
Choose what interests you or what you want to challenge. Never try to imitate popular blogs because that would just turn the activity into a chore; making it harder and less productive since there are always imitators that maybe more popular.
You need to know who you want to attract, the type of blog example if you are blogging about destinations use one which is colurful has different buldings and landscape. most best themes are paid for i would encourage u get more in wordpress