This is the new periodic list in the Design category: The monthly 10 Best New Premium Themes! It’s a round-up of the finest Premium WordPress themes released in the previous month, listed for your browsing convenience.

These are the best Premium WordPress themes released in the month of May 2011:

1 ECOBIZ – Business Theme

$35

  • single-site licence

Features:

  • 6 Pre-defined Skins (Blue, Green, Red, Orange, Dark, Brown)
  • Unlimited bakckground color option + 25 background patterns included
  • Custom background Image
  • Multi level Dropdown Menu
  • Custom Post type for slideshow
  • User friendly shortcodes
  • Translation ready (available .po file)
  • 10 Custom Widgets (Support for Multiple Instance Widget)
  • Built in Ajax Contact Form with validation
  • and much more

2 Village – Photography Portfolio Theme

$35

  • single-site licence

Features:

  • Easy installation
  • Built-in SEO tool
  • Font Management
  • Written and Video theme guides
  • Interactive jQuery walls
  • 3 Fullscreen Slideshows
  • 5 skins
  • Drag-and-drop Gallery Manager
  • and much more!

3 Aggregate – Magazine Style Theme

$39/year

Features:

  • Unlimited color schemes
  • dozens of fonts
  • automated thumbnail resizing
  • optional blog-style structure
  • custom widgets
  • built-in  advertising management

4 TheCotton – Minimalistic Theme

$35

  • single-site licence

Features:

  • Unlimited skins
  • 40 pattern backgrounds included
  • Powerful admin area (powered by Pexeto Panel)
  • 3 jQuery Featured Content/Image Sliders
  • Portfolio Gallery template
  • and much more!

5 Gridlocked – Minimalist Theme

$35

  • single-site licence

Features:

  • Gimmick-free, Grid-Based Design & Valid HTML
  • Dark & Light Colour Schemes
  • Filterable Portfolio (can be used as homepage or site section)
  • Tumblr-style Blog (can be used as homepage or site section)
  • Built-in “like” system – no plugin necessary
  • Full Localisation/Language Support (contains .po/.mo files)
  • 2 Custom Widgets (Twitter, Flickr)
  • Simple Theme Options (Unbranded!)
  • WordPress 3.0 Ready (Menus & Featured Images)
  • jQuery Magic (Re-shuffling grids – try resizing your browser!)
  • and more!

6 Briefed – Portfolio Blog Style Theme

$70

  • single-site licence

Features:

  • jQuery Featured slider
  • Custom Homepage
  • Portfolio Page Template
  • Custom Post Types
  • Custom Typography
  • Custom Widgets
  • Alternative Styles

7 Core – Photography Portfolio Theme

$35

  • single-site licence

Features:

  • 3 Homepage styles
  • Full Screen slideshow for Photo Gallery
  • Built-in Font Manager. You can upload your own font
  • Extensive galleries admin. Support multiple images upload
  • 4 Portfolio styles
  • 8 Custom Widgets
  • Styled typography and flexible page columns
  • Blog page single post and comments
  • and more!

8 Eptonic – Minimalistic Blog Theme

$35

  • single-site licence

Features:

  • Awesome portfolio styles and options
  • Drag & Drop system
  • 29 Fonts for headings (with Google Font API )
  • 6 Custom widgets (to use in the sidebar)
  • 10+ Shortcodes
  • Contact Form with jQuery (email) validation
  • Show/hide Author box on the blog
  • Custom logo replacement
  • and much more!

9 Catalyst – Portfolio Theme

$35

  • single-site licence

Features:

  • Free Unlimited Upgrades
  • Translation-Ready
  • GUI Shortcodes generator
  • 100 Icons shortcode
  • Featured Content/Image Slider
  • Advanced theme options
  • Portfolio
  • Videos and Images Lightbox
  • and a whole lot more!

10 Peano Creative – Portfolio Blog Theme

$35

  • single-site licence

Features:

  • Unique portfolio
  • Clean and minimalist design
  • Unlimited colors
  • 45 shortcodes
  • 38 background options with an option to use your own background image/color
  • jQuery enhanced
  • 14 fonts (font-face)
  • Rich styling options (buttons, images, sliders, tabs, toggle, columns, lists, etc)
  • Social Icons
  • and more!