If you disagree with something, make your case politely. In fact, one of the factors that makes a chord progression sound interesting is it's use of chords that don't directly belong to it's key. You might also try using borrowed cords, taking your inspiration from another key.
Try getting clear on the chords that belong to a major scale, and then add one new chord to your vocabulary each time you sit down to write music. The best way to improve your skills is to study popular chord progressions. Roman numerals are the symbols most commonly used to describe how chords work within keys.
He creates music under the name Straight White Teeth and has a great affinity for dogs and putting his hands in his pockets.
Here are some common diminished chord shapes. Or, we might try the flat iii to the flat IV. Most of our songs utilize in some way the I chord, the IV chord, the V chord, and the vi minor chord.