Head Logo and banners/ads for webshop

We are upgrading our platform, and at the same time changing domain and name. So we are looking for a new "head" logo that matches the Theme for our coming web-shop. We will also need some banners and ads for the new site that also should match the theme. We are selling spare-parts for heating equipment so the design should be clean and a bit industrial, nothing fancy, and it should follow the colors and style for our chosen theme. (Prestashop platform) Budget is depending on how many logos, banners we get and how well they fit the theme. We can work both with Fixed price or Timebudget Time: We expect to get the work done within 2 weeks.