I\'m sorry if the question title wasnt clear, but I\'m trying to make something like this, I dunno if they are tiles or images inside a WrapControl:
You are on the right track. WrapPanel is the way to go :)
To make each block more interesting, you can take a look at the HubTile control from the latest windows phone toolkit. Whatever controls/panels you are using, just remember the size should be 173*173.
Use a ListBox
In one of my projects I created a ListBox that does all this. The reason that I use a ListBox is because ListBox has a SelectedItem propery which tells me which tile is tapped by the user. Also another reason is ListBoxItems can receive the nice tilt effect.
Baiscally you just need to create a tile-like ListBoxItem style and apply it to the ListBox's ItemContainerStyle, also you need to set the ListBox's ItemsPanel to be a WrapPanel.
How it looks

The ListBoxItem Style
The ListBox
You can see the last item is actually a HubTile.
Hope ths helps! :)