A powerful tactic to overcome this (creative block: my remark) is taking a project and breaking it down into smaller pieces. Once you stop looking at your project as a whole, things don't look as obvious as they were before. Write down a list of all the elements in your current project—presentation topics, blog post paragraphs, web site elements, and more. Then focus on one part at a time and change just that one. The most interesting thing about this tactic is that just dividing a project into a discrete list of elements will help ideas to start flowing. Once you have your list you can do wonders with it. Here are a few quick examples:
Focusing on one part and changing it completely.
Removing a part.
Combining random parts.
.....and further, it sais.....
When your creativity needs to play the main role, it's no longer about having the ‘right' answer, but about providing a set of different answers to the same question. When you're facing a difficult problem—try to create a number of different answers. This will help you solve it more quickly, and in a more creative way. Before you start a project or a part of it, draft 5-6 different alternatives. It might be 6 different ways to pitch the same idea, or 6 different design themes for a website. I make sure to prepare a list of all the alternatives before starting so I won't get fixated.