Here are over 50 T-shirt sayings and quotes ideas:

Inspirational Quotes

1. "Believe in yourself."
2. "Dream big, work hard."
3. "Stay positive."
4. "Be the change."
5. "Good vibes only."
6. "Chase your dreams."
7. "Live life to the fullest."
8. "Be kind."
9. "Stay humble."
10. "You are enough."

Funny Sayings

1. "I'm not arguing, I'm just explaining why I'm right."
2. "I can’t adult today."
3. "Sarcasm is my superpower."
4. "Procrastinators unite... tomorrow."
5. "I’m not lazy, I’m on energy-saving mode."
6. "Why yes, I do bite."
7. "Running late is my cardio."
8. "I’m silently correcting your grammar."
9. "I need a six-month vacation, twice a year."
10. "Exercise? I thought you said extra fries."

Motivational Phrases

1. "Just keep going."
2. "One step at a time."
3. "You got this."
4. "Stay focused."
5. "Never give up."
6. "Believe in the magic."
7. "Rise and grind."
8. "Make it happen."
9. "Hustle and heart."
10. "Push through the pain."

Life and Love

1. "Live, laugh, love."
2. "Love more, worry less."
3. "Family is everything."
4. "Do what you love."
5. "Life is a journey, not a destination."
6. "Follow your heart."
7. "Home is where the heart is."
8. "Love yourself first."
9. "Together is a wonderful place to be."
10. "Happiness is homemade."

Geek and Nerd Quotes

1. "There is no place like 127.0.0.1"
2. "May the force be with you."
3. "Keep calm and game on."
4. "Eat, sleep, code, repeat."
5. "I speak fluent sarcasm."
6. "I’m a genius, just on a different frequency."
7. "Ctrl + Alt + Del your problems."
8. "Resistance is futile."
9. "I have a degree in sarcasm."
10. "I'm not a nerd, I'm just smarter than you."

Travel and Adventure

1. "Adventure awaits."
2. "Wanderlust."
3. "The world is your playground."
4. "Explore more."
5. "Collect moments, not things."
6. "Travel far and wide."
7. "Find joy in the journey."
8. "Go where you feel most alive."
9. "Discover the unknown."
10. "Life is an adventure."

Feel free to mix and match or tweak these to fit your style and audience!