Psalm 8
This is a wonderful psalm for meditation on the majesty of God’s works and the insignificance of man. When we consider the majesty of God’s awesome works in the universe, we cannot but wonder that He should notice such an insignificant creature as man, and yet He made us but a little lower than angels.
"What is man that you are mindful of him.."
"You made him a little lower than the heavenly beings..."

"You made him ruler over the works of your hands, you put everything under his feet...:
God has given us tremendous authority and responsibility over the whole earth. He holds us accountable for our stewardship of it. He wants us to take care of it. But He doesn't want us to worship the creation. He wants us to worship the creator.

 “From the lips of children and infants you have ordained praise.”
Now, that puts things in perspective. Does it give us a clue as to how we should interact with our children? Even infants can feel His presence and often they feel God’s presence through us big people! How are all of us doing with that one?
Children trust and praise God without doubt or reservations. Shouldn't we do the same?

Psalm 9
In the midst of all distresses, we may by faith find a refuge in God and when victory comes, we should not forget that He expects returns of praise.

Psalm 16
We should forever meditate on the goodness of God. 
“Lord you have assigned me my portion and my cup; you have made my lot secure. The boundary lines have fallen for me in pleasant places; surely I have a delightful inheritance.”
What great assurance in this passage. He has placed us exactly where He wants us to be. Our salvation is secure. His laws, statutes, precepts, and commands are our boundary lines. Our delightful inheritance awaits us...
David refers to Jesus in this psalm with "nor will you let your Holy One see decay."

Psalm 19
Oh, so very much to ponder in this psalm.
God makes Himself known through His handiwork.  He makes Himself known through nature, which every single person on the face of the planet MUST recognize!   He makes Himself known through the law which is the guiding force.  He makes Himself known through people - you and me. Jesus is the Sun of Righteousness, the Bridegroom who rejoices to reveal Himself to men.
After reading Psalm 19, surrounded by this fantastic display, how can anyone say that it happened by chance?

Psalm 21
The psalm looks forward to Jesus, who is God over all; once crowned with thorns but now wearing the  crown of glory.

Psalm 24
David asks the question, "Who may ascend the hill of the Lord?  Who may stand in his holy place?"
And then answers with, "He who has clean hands and a pure heart, (those who are living a godly life operating with pure motives), who does not lift us his soul to an idol...
We are being told in this psalm to live a godly life with pure motives, giving ourselves only to Him, with no thoughts to anything false or to any idol.  The words in the last few verses are symbolic of opening up our hearts to have God dwell within.