from my queries, and from my readings, here's a raw unedited list of things that people do for spiritual practice.  comments or additional suggestions are encouraged.

pilgrimage

setting intention in a spiritual way

prayers of gratitude

journaling

silent reflection

looking at the stars

sacred reading (lectio divina)

labyrinth

discipline

sabbatical

giving

grieving

deep listening

experiencing nature

meditation

prayers of praise

non violent communication

quality time with family/friends

deep breathing/counting breaths

honesty

music

contemplation

participation in a support group

study

charity

tithing

accepting help/complements gracefully

composting/recyling/reusing

sacred space in the home (altar)

marriage

simple living

cooking

repentance/asking for forgiveness/apologizing/making amends/accountability

building a theology

writing out a written "moral inventory"

prayers of petition, expressing hopes and desires, asking for things for self

good ham sandwich or excellent golf shot

penitence

worship service at church/temple/mosque/etc

fasting

non-violence

golf

spiritual direction/mentoring

gratitude list

striving for balance

upright posture

blessings/prayers of blessing

social justice action

commitment

chanting

centering prayer

giving thanks at specific times, for instance saying a prayer/grace at dinner

prayers for forgiveness

The Rosary

vegetarianism / mindful eating

parenting

recitation

hunting

dance

Divine Mercy Chaplet

collect sacred objects

prayer beads or other meditation by hand

stations of the cross

prayers of intercession, asking for help for someone else

silent retreat

bodily prayers (sign of the cross/kneeling/prostration/spreading the palms)

rote prayers

taking Communion

make art (sculpting, painting, quilting, etc etc)

living according to a belief system/theology

silence

practicing mindfulness

movement/physical spirituality (yoga, tai chi, aikido, martial arts, exercise, etc)

seeking contentment

Mass

keeping the sabbath / a day of rest

any kind of spiritual retreat

meditative walking

detachment from attachment

self reflection

gardening

service

living by a rule of life